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Old August 22nd, 2016, 03:48 PM   #361
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Originally Posted by Wilhem275 View Post
As a driver, I'd strongly prefer the top example, since it totally avoids the bottleneck of the onramp merging into a single lane. Everyone gets its own lane and all the merging manouevers can be carried out easily on a longer distance.
This may be a valid argument when the merging traffic flow is high. Still, the design is different from how motorways typically are constructed, also in Italy, and therefore potentially a bad design. The common concept is that the merging traffic is the one to yield.

The discussion was initially about Swedish 2+1 roads where the merging seldom creates any capacity issue. I made a quick look on my cockpit video from the last year from my southbound trip on the E4 in Sweden. There is a 30 km section of 2+1 road between the motorway endpoints in the south. The section has six merging ramps (five junctions and a service area). The traffic on the main road was moderate, but the number of vehicles merging was zero. Thus, every thru-traffic driver had to change lanes six times. It is hard to see any other reason than to keep the drivers awake

(The AADT figures show that number of merging vehicles on this section is about 2 to 10 per cent of the main road traffic flow. The figures are highest at the junctions on Ljungby where the E-W main road 25 meets the E4.)

Last edited by MattiG; August 22nd, 2016 at 04:05 PM.
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